第76章 对火星轨道变化问题的最后解释

    作者君在作品相关中其实已经解释过这个问题。

    不过仍然有人质疑——“你说得太含糊了”，“火星轨道的变化比你想象要大得多！”

    那好吧，既然作者君的简单解释不够有力，那咱们就看看严肃的东西，反正这本书写到现在，嚷嚷着本书bug一大堆，用初高中物理在书中挑刺的人也不少。

    以下是文章内容：

    long-termiionsandstabilityofplaaryorbitsinoursolarsystem

    abstract

    wepresenttheresultsofverylong-termnumeritegrationsofplaaryorbitalmotionsover109-yrtime-spansincludingallnineplas.aquispeofournumericaldatashowsthattheplaarymotion，atleastinoursimpledynamicalmodel，seemstobequitestableevehisverylongtime-span.acloserlookatthelowest-frequencyoscillationsusingalow-passfiltershowsusthepotentiallydiffusivecharacterofterrestrialplaarymotion，especiallythatofmercury.thebehaviouroftheetriercuryinouriionsisqualitativelysimilartotheresultsfromjacqueslaskar'ssecularperturbationtheory(e.g.emax～0.35yr).however，therearenoapparentsecularincreasesofetricityorinationinanyorbitalelementsoftheplas，whichmayberevealedbystillloermnumeritegrations.wehavealsoperformedacoupleoftrialiionsincludingmotionsoftheouterfiveplasoverthedurationof±5x1010yr.theresultindicatesthatthethreemajorresoheune–plutosystemhavebeenmaintainedoverthe1011-yrtime-span.

    1introdu

    1.1definitionoftheproblem

    thequestionofthestabilityofoursolarsystemhasbeeedoverseveralhundredyears，siheeraofon.theproblemhasattractedmanyfamousmathematisovertheyearsandhasplayedatralroleinthedevelopmentofnon-lineardynamidchaostheory.however，wedohaveadefiniteahequestionofwhetheroursolarsystemisstableornot.thisispartlyaresultofthefactthatthedefinitionoftheterm‘stability’isvaguewhenitisusediiontotheproblemofplaarymotioninthesolarsystem.actuallyitisogiveaclear，rigorousandphysicallymeaningfuldefinitionofthestabilityofoursolarsystem.

    amongmanydefinitionsofstability，heretthehilldefinition(gladman1993):actuallythisisnotadefinitionofstability，butofinstability.wedefineasystemasbeingunstablewhenacloseenteroccurssomewhereiem，startingfromacertaininitialfiguration(chambers，wetherillitotanikawa1999).asystemisdefinedase